Mojave National Preserve

Construction cranes rise like storks 40 stories above the Mojave Desert. In their midst, the "power tower" emerges, wrapped in scaffolding and looking like a multistage rocket.

Clustered nearby are hangar-sized assembly buildings, looming berms of sand and a chain mail of fencing that will enclose more than 3,500 acres of public land. Moorings for 173,500 mirrors — each the size of a garage door — are spiked into the desert floor. Before the end of the year, they will become six square miles of gleaming reflectors, sweeping from Interstate 15 to the Clark Mountains along California's eastern border.